• 농업과학연구
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• 제6권2호
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• pp.97-104
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• 1979

새로운 도열병균의 생태형에 대하여 감수성이 높은 수도 통일계 품종 밀양 23호의 도열병의 발생경과와 발생양상에 미치는 시비수준의 영향을 구명하기 위하여 이 연구를 시도하였다. 그 동안에 얻은 연구 결과는 다음과 같다. 대체로 시비수준이 높아짐에 따라 밀양 23호는 도열병에 대하여 감수성이 더욱 높아지며 발병과 시비 수준사이에 밀접한 관계가 인정되었다. 이와 같은 관계는 마디도열병이나 이삭목도열병의 발생보다도 잎도열병 발생에 있어서 더욱 뚜렷하게 나타난다. 시비수준이 낮은 경우에도 마디도열병이냐 목도열병이 상당히 많이 발생하며 시비수준이 높은 경우의 마디 또는 이삭목도열병의 발생과 차이가 크지 않았다. 따라서 시비수준을 조절하므로서 마디 또는 목도열병을 회피시킨다는 것은 불가능할지 모르며 또한 잎도열병의 발생상으로부터 목도열병을 예찰한다는 것도 곤란한 일이라 생각된다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.112-112
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• 2017

Rice blast caused by Magnaporthe oryzae is one of the most serious diseases that affect the quantity and quality of rice production. The use of resistant rice varieties would be the most effective way to control the rice blast. However R gene incorporation into the rice variety takes time and pathogen could overcome the R gene effects after for a while. For monitoring the rice blast resistance gene distribution in Korean varieties, the four major blast resistance genes against M. oryzae were screened in a number of Korean rice varieties using molecular markers. Of the 120 rice varieties tested, 40 were found to contain the Pi-5 gene, 25 for the Pi-9 gene, 79 for Pi-b and 40 for the Pi-ta gene. None of these rice varieties includes tested 4 R genes. 3 R genes combination, Pi-5/Pi-9/Pi-b, Pi-5, Pi-9.Pi-ta, or Pi-9/Pi-b/Pi-ta were found in 12 varieties, the rice blast disease severity were showed as resistant in the rice verities containing Pi-9/Pi-b/Pi-ta R genes combination, respectively. Also pathogenic diversity of M. oryzae isolates collected in the rice field from 2004 to 2015 in rice field in Korea were analyzed using rice blast monogenic lines, each harboring a single blast resistance gene. Compatibility of blast isolates against rice blast monogenic lines carrying the resistance genes Pi5, Pi9, Pib, and Piz showed dynamic changes by year. It indicates that pathogen has high evolutionary potential adapted host resistances to increase fitness and would lead to rice blast resistance bred into the cultivar becoming ineffective eventually.

• 한국전산구조공학회논문집
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• 제30권5호
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• pp.427-434
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• 2017

최근 테러에 대한 위험성의 증가로 대중들의 폭발 피해에 대한 인식이 증가하였다. 우리나라에 방폭 설계에 대한 기준이 미흡하며, 현재 적용하고 있는 방폭 설계도 정적해석으로 건물의 안정성 및 경제성을 위해 방폭 설계를 개발해야 하는 상황이다. 또한 지진 발생 증가로 내진 설계 의무화가 확대된 가운데 방폭 설계를 하지 않고 내진 설계를 적용한 부재의 방폭성능을 판단을 연구한다. 현재 보편적인 폭발 하중의 해석 방법은 UFC 3-340-02 매뉴얼을 참고하는 것이다. UFC 3-340-02 매뉴얼을 통한 폭발 하중의 특성을 적용하고 KBC 2016의 내진 상세를 적용한 보를 등가 단자유도 시스템으로 변환하여 폭발저항 성능을 연구하였다. 보통, 중간, 특수 모멘트 골조의 연성 능력에 대한 최대 처짐을 고려하여 폭발물의 이격 거리를 통해 평가하여 내진 상세 적용 시 폭발 저항 성능이 향상된다는 것을 입증하였다.

• The Plant Pathology Journal
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• 제21권4호
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• pp.402-405
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• 2005

We have previously identified genes for four different protease inhibitors (PIs) that were induced upon rice blast infection in a rice blast resistant mutant SHM-11. Our expression analysis of the PIs indicated that induction of the PIs was the highest 24 hr after rice blast inoculation in the rice mutant SHM-11. Three PIs in the group of serine PIs were highly expressed while a cystein PI was weakly expressed upon rice blast inoculation. Four PIs were weakly induced 48 hr after pathogen inoculation in rice blast susceptible wild type rice plant. The simultaneous expression of three serine PIs was apparent from SHM-11 and two of them were induced in rice blast resistant Taebaegbyeo. One of them was induced in rice blast resistant Hwayeongbyeo while none of them were expressed in rice blast susceptible Nagdongbyeo and rice blast resistant Dongjinbyeo. Our results suggest that the expression of PI gene is rice cultivar specific and may be linked with the rice blast resistance in a specific rice mutant by the simultaneous expression of the PI genes.

• 대한토목학회논문집
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• 제39권3호
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• pp.369-380
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• 2019

PSC 구조물에 폭발과 같은 극한하중이 짧은 시간 동안 발생하게 되면 급작스러운 파괴와 그로 인한 수많은 인명 및 재산피해를 발생시킨다. 하지만 원전격납구조물, 가스탱크와 같은 PSC 구조물의 경우 방호 및 방재개념이 포함된 구조설계가 적용되지 않은 실정이며, 특히, 구조물 내부에서 발생하는 폭발압력하중은 피해규모가 외부폭발에 비해 훨씬 크기 때문에 내부폭발하중에 대한 검증은 반드시 필요하다. 따라서, 본 연구에서는 원전격납구조물의 내부폭발에 대한 저항성능을 검토하기 위해 이방향 프리스트레스트 콘크리트 축소모형을 제작하였다. 내부폭발 실험은 22.68, 27.22, 31.75 kg (50, 60, 70 lbs)의 ANFO 폭약을 이용하여 시편으로부터 1,000 mm의 거리에서 폭발시켰으며, 압력하중, 처짐, 변형률, 균열형상, 긴장력 변화 등의 데이터를 분석하였다. 본 연구결과를 이용하여 원전격납구조물의 내부폭발하중 발생 시 손상도 범위 예측이 가능할 것으로 판단된다.

• 인터넷정보학회논문지
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• 제8권4호
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• pp.61-70
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• 2007

본 논문에서는 V-BLAST (Vertical-Bell-lab Layered Space Time) 복호 알고리즘의 ordering과 slicing 과정에 사전 확률로서 사용되는 MAP 디코더의 외부 정보를 이용한 최적의 터보 부호화된 V-BLAST 적응 변조 시스템을 제안 후 성능을 관찰한다. 채널 상태에 따라 변조 방식을 달리하는 적응 변조 시스템을 기존의 터보 부호화된 V-BLAST 시스템과 최적의 터보 부호화된 V-BLAST시스템에 각각 적용하고 전송률 및 SNR을 비교하여 제안된 시스템을 적용할 경우 어느 정도의 성능 개선이 있는가를 살펴본다. 또한, 제안된 시스템에 선택적 전송 다이버시티 (STD : Selection Transmit Diversity) 기법을 적용한 후 성능의 향상을 관찰한다. 모의 실험결과, 적응 변조 시스템에서 최적의 터보 부호화된 V-BLAST 기법을 적용한 경우가 기존의 터보 부호화된 V-BLAST 기법을 적용한 경우에 비하여 전체적인 SNR 영역에서 SNR 이득이 나타났고 11dB의 SNR에서 최대 약 350Kbps의 전송률 향상이 나타났다. 또한 제안된 시스템에 선택적 전송 다이버시티가 적용된 경우에는 기존 시스템과 비교하여 같은 SNR영역에서 최대 약 1.77Mbps의 전송률이 개선됐으며, 특히 4Mbps의 전송률 성능을 만족시키기 위한 SNR 성능에서는 약 5.88dB의 이득을 보였다.

• 한국자원식물학회지
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• 제27권6호
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• pp.687-700
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• 2014

Rice blast (Magnaporthe oryza B.) is one of the most important diseases in rice that causing great yield losses every year around the world. It is important to screen valuable genetic resources for improving blast resistance. This study was conducted to identify the blast resistance in 279 Korean rice landraces using blast nursery tests and isolate inoculum screening. The results showed that 11 landrace accessions found to be resistant to rice blast in blast nursery and inoculation screening tests and the degree of lesions in most accessions showed that they were susceptible to reactions. In order to find the distribution of blast resistant genes, a molecular survey was conducted to identify the presence of major blast resistance (R) gene in 279 Korean landraces. The results revealed that their frequency distribution was Pik-m (36.2%), Piz (25.4%), Pit (13.6%), and Pik (10%). Besides, the frequency distribution of Piz-t, Pii, Pik-m/Pik-p, Pi-39(t), Pib, Pi-d(t)2, Pita/Pita-2 and Pi-ta genes were identified as less than 10%. The results did not consist with the reactions against blast diseases between genotypes and phenotypic part of the nursery tests and isolate inoculation. For concluding these results, we used genome-wide SSR markers that have closely been located with resistance genes. The PCoA analysis showed that the landrace accessions formed largely two distinct groups according to their degree of blast resistance. By comparing genetic diversities using polymorphic information contents (PIC) value among the resistant, total and susceptible landraces, we found that PIC values decreased in four SSR markers and increased in six markers in the resistant accessions, which showed contrary to total and susceptible groups. These regions might be linked to resistance alleles. In this study, we evaluated the degree of blast resistance and the information about the distribution of rice blast resistant genes in Korean rice landraces. This study might be the basis for association analysis of blast resistance in rice.

• 복합신소재구조학회 논문집
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• 제6권1호
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• pp.38-44
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• 2015

In this paper, a finite element dynamic simulation study was performed to gain an insight about the blast wall test details for the offshore structures. The simulation was verified using qualitative and quantitative comparisons for different materials. Based on in-depth examination of blast simulation recordings, dynamic behaviors occurred in the blast wall against the explosion are determined. Subsequent simulation results present that the blast wall made of high energy absorbing high manganese steel performs much better in the shock absorption. In this paper, the existing finite element shock analysis using the LS-DYNA program is further extended to study the blast wave response of the corrugated blast wall made of the high manganese steel considering strain rate effects. The numerical results for various parameters are verified by comparing different material models with dynamic effects occurred in the blast wall from the explosive simulation.

• 한국군사과학기술학회지
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• 제7권3호
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• pp.122-128
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• 2004

Internal blast performance test on developed explosives was carried out. Internal blast means a blast wave in closed chambers like tunnels, bunkers, operation center and chamber of ships. We used Anpa tunnel for our test facility. We performed two series of tests to measure internal blast of developed explosives. Three different kinds of cast PBXs, DXD-09, DXD-10, DXD-18, and conventional explosive, Tritonal, were used in our test. The explosives were cast as a charge of 108mm diameter in a plastic tube of a 3mm thickness. The length of charges 4ere adjusted as a weight 3kg. A melt-cast explosive, tritonal, was used as a reference. Pentolite booster was used. The cylindrical boosters have a 95mm diameter and 47.5mm height. The results showed that there may be some differences between the performances in the air blast tests and those in the internal blast tests. The results showed that DXD-10, the best performance in air blast tests, showed the poorest performance in internal blast among the explosives tested. On the other hand, DXD-18 showed exactly the opposite trend. This is probably due to the highest contents of aluminum and inert binder in DXD-18. DXD-18 has $38\;wt\;\%$ of aluminum and $17\;wt\;\%$ of inert binders.

• The Plant Pathology Journal
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• 제31권1호
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• pp.12-24
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• 2015

Rice Blast is the most devastating disease causing major yield losses in every year worldwide. It had been proved that using resistant rice varieties would be the most effective way to control this disease. Molecular screening and genetic diversities of major rice blast resistance genes were determined in 192 rice germplasm accessions using simple sequence repeat (SSR) markers. The genetic frequencies of the 10 major rice blast resistance genes varied from 19.79% to 54.69%. Seven accessions IC337593, IC346002, IC346004, IC346813, IC356117, IC356422 and IC383441 had maximum eight blast resistance gene, while FR13B, Hourakani, Kala Rata 1-24, Lemont, Brown Gora, IR87756-20-2-2-3, IC282418, IC356419, PKSLGR-1 and PKSLGR-39 had seven blast resistance genes. Twenty accessions possessed six genes, 36 accessions had five genes, 41 accessions had four genes, 38 accessions had three genes, 26 accessions had two genes, 13 accessions had single R gene and only one accession IC438644 does not possess any one blast resistant gene. Out of 192 accessions only 17 accessions harboured 7 to 8 blast resistance genes.